TY - JOUR A1 - Baumgärtel, Hellmut T1 - An Application of the DR-Duality Theory for Compact Groups to Endomorphism Categories of C*-Algebras with Nontrivial Center Y1 - 2001 ER - TY - JOUR A1 - Baumgärtel, Hellmut A1 - Carey, A. T1 - Hilbert systems for actions of the circle group Y1 - 2001 ER -